<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #one{
            width: 200px;
            height: 200px;
            border-radius: 50%;
            border: 10px solid #ccc;
            border-right-color: #46e520;
            border-top-color: #46e520;
            animation: loading 2s linear 0s infinite;
        }
        @keyframes loading {
           /* 0%{
                transform: rotate(0deg);
            }
            50%{
                transform: rotate(180deg);
            }*/
            100%{
                transform: rotate(360deg);
            }

        }
    </style>
</head>
<body>
<div id="one"></div>
</body>
</html>